The primary endpoints of the investigation will include assessment of the maintenance of disc height and fusion rates demonstrated by radiographic evidence based on plain radiographs. Fusion is defined as a bone bridging across the disc space at the level of the InterFuse T implant. Length of stay, implant migration, implant subsidence, re-operation rate and opioid use will be recorded. It is anticipated that outcomes with the InterFuse T Interbody Fusion Device will be comparable to or better than the historical published results for other non-modular TLIF devices and to the control device used concurrently in the study